wedege



3 Sheets- Sheet l.

(No Model.)

N. P. WEDEGE. 4 Woon PULP BOILBR.

Patented Apr. 23, 1895.L

.Tru/enfer,

(N Model.) 4s sheets-sheen 2. N. P. WEDEGB. WOOD PULP BGILBR.

Patented Apr. 23, 1895.

(No ModeL). 3 Sheets-Sheet 3.

N, P. WBDBGE. WOOD PULP BOILER.

No. 537,951. PatentedApr. 2s, 1895,

:E: E E: z

Wymesses 4o f', dotted lines Fig. 1 and passing through the 7c held in turn by the smaller nut suitable Nits PETER WEDEGE, or

A'rENr THRoNDi-IJEIM, NORWAY.

wooo-Pu LP BO'ILEE. 1

SPECIFICATION forming part of Letters Patent No. 537,951, dated April 23, 1895..

Application ned :rune 25, 1894.

To all whom i may concern.'

Be it known that I, NILs PETER WEDEGE,v engineer, a subject of the King of Sweden and Norway, and a resident of Throndhjem, Norway, have invented a new and useful Improvement in lVood-Pulp Boilers, ot' which the following is a specilication. 1

`ly invention includes a boiler having upper and lower manholes with covers therefor and clamping means arranged outside of the boiler to hold the lower cover in place and a hoisting rod extending from the lower plate, which is movable inwardly, up through the boiler and through the upper plate.

In the drawings, Figure 1 is a sectional view of the boiler with means for controlling the upper and lower covers. Fig. 2 is a detail view of the upper manhole and its cover in section. Fig. 3 is a detail view ot the lower manhole in section; Fig. 4, a detail of the same with the outlet pipe fixed thereto; and Fig. 5 a sectional detail View of a modified form ot manhole cover.

The lower manhole plate a is controlled to open and close the said manhole by connections therefrom leading through the upper manhole plate.

a is the lower manholeplato or cover which with packing a rests against the flange h about the lower manhole. This plate is kept close to the iiange b by the pressure in the boiler and also by the screw rod and nuts b2 b3 b3 said rod being connected with the plate and passing through a removable spider b'. Bars a2 connect the cover plate a with the strainer o which lies close against the inner masonry d of the boiler. An open steam space e is thus formed between the plate ct and strainer, the steam entering portf from pipe strainer into the boiler chamber for heating the contents. The bars a2 above the strainer c have eyes connected with a ring g on the lower end of a rod h bylinks c3. The bar h is loosely connected with a threaded rod h2 extending up through the upper` manhole cover fi. A casingjon the cover 't' surrounds the bar h2 and forms a support for the nut k screwed on the rod for holding and adjusting the same. The nut 7c is covered by the hood serai No. 515,569. (No model.)

` packing being interposed between the casing and the cover 'L'.

All the interior parts of the boiler are covered with lead or other suitable acid resisting material forprotection against the influence of lye.

The position of the parts in Fig. l is that assumed by them when the boiler is in operation and the steam is being admitted to boil the contents.

When the boiling has been completed and the discharge is to take place, it will be eftected as follows: The gas is first blown out through the opening m Fig. l. The clamping spider o is loosened and withdrawn by screwing off the lower nut b3 the cover plate a still remaining on its seat by the internal pressure. The discharge pipe Z is next fixed under the lowerr discharge opening in place of the removed spider, nuts l being provided for this purpose. The discharge pipe leads the boiled material to any suitable receptacle. Steam may now be let into the mass ot material through the pipe m3 provided with jet openingswhich pipe connects with the port m2 dotted lines Fig. l.V The upper nut 7c is then turned raising the rod h2 and through it and the rod h the lower manhole cover a thus allowing the material tobe discharged through the pipe Z, the pressure within the boiler insuring a complete discharge. Then the pulp has been discharged the steam is shut off, the discharge pipe l is removed, the clamping spider o putin place and the lower manhole cover again seated. The boiler must now be relled with splinters or material to be treated and it is therefore necessary to open the upper manhole cover i. In order to do this however, it is necessary to provide means for holding the bar h2 up and preventing the same from falling down into the boiler. In order to remove the covert' the upper nut k must be screwed ott of the rod h2 altogether. A chain or cord must then be fixed to the Lipper ring h3 of the screw rod and the screw rod may then be let down until the wedge h4 dotted lines Fig. 2 which is now temporarily inserted in a hole hw of the bar h2 rests upon the cross bar extending across the upper manhole and thus the bars 7i and h2 remain suspended. The cover i may now rests upon the said bar h5 when the bar h2 is` down and the said bar h2 is thus prevented from being displaced during the filling operation.

Theupper manhole cover and the casingj and nut 7o are merely threaded over the cord or chain and the end of the screw rod, when replacing the said cover after the filling has been completed.

Fig. 5 shows a modification to be used Where the upper and lower manholes do not lie in the same vertical plane with their axial lines coinciding. The parts j, 7c, 7a2 are substantially the same as those described, except that they are fixed directly to the boiler and not to an upper manhole cover. This arrangement is used independently of the ll ing opening, that is to say, the filling would take place through any suitable cover which is outl of line with the discharge while the discharge cover would be controlled by the rod 77,2 held as shown in Fig. 5, the plate j merely covering an opening formed directly in the boiler instead `of covering an opening in the filling cover.

I claim- 1. In combination in a cellulose boiler, the upper and lower manholes, the cover plates therefor, the outside clamp for holding the lower cover plate down upon its seat, and the hoisting rod extending from the lower plate up through the boiler and through the upper plate, said lower plate being movable inwardly and being arranged to be lifted into the interior of the boiler by the hoisting rod.

2. In combination in a cellulose boiler, the upper and lower manholes, the cover plates therefor, the lower one being movable toward the interiorof the boiler, the chamber e above the lower man hole and connecting with the interior of the boiler, the screen between the said chamber and the boiler chamber and the hoisting rod extending through the boiler and connected with the said screen and lower man hole cover, substantially as described.

3. In combination with the boiler, thelower man hole, its cover plate and the hoisting means consisting of the bar extending up through the boiler, the upper cover plate through which the upper screw threaded end of the rod extends,the nut on the rod and the casingjon the upper plate to which the casing is attached, substantially as described.

4. In combination with the boiler, the lower man hole, the closing plate therefor, the hoisting rod screw threaded at its upper end and passing through the closing plate of the upper man hole, the adjusting nut on the threaded end, the cover inclosing the said nut and the nut for holding the cover, substantially as described.

5. In combination, the boiler, the lower man hole cover, the upper filling cover, the hoisting rod attached to the lower manhole cover and extending through the upper filling cover, means for holding the upper end of the rod and the cross bar h5 and wedge h4 for supporting the hoisting bar when the cover is removed and the filling is taking place, substantially as described.

6. In combination, the boiler having the lower manhole, the cover therefor, the hoisting rod extending from the lower cover through the boiler and out at the top thereof, the casingj through which the upper end of the rod passes, and the nut for holding the rod thereto, substantially as described.

In testimony that I claim the foregoing as my invention I have signed my name, in presence of two witnesses, this 26 h day of April, 1894.

NI LS PETER VEDEGE.

Witnesses:

AXEL GOTTFRED GRoNN LAHN, RICHARD EMANUEL STOKKE. 

